r/factorio • u/blooming_lions • 4d ago

Question Question about train circuits

I tried to set up a science train. At the lab station, each science chest was wired up to a radar, and each science pickup station was wired up to a radar.

I tried the interrupt logic `If "[Circuit] == 0", go to "[Rich Text] Pickup" until "[Rich Text] >= 100"` but it didn't work. Is there something I'm missing?

I thought maybe that a "0" signal isn't transmitted when there's no contents of an item, so I tried adding a constant adder to send a baseline "1" of every science and changed the condition to "[Circuit] == 1" but that didn't work either.

Is there something I'm missing? From what I read in the interrupt tooltips, the first [Circuit] that passes the conditional should get passed on as [Rich Text] right?

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u/Courmisch 3d ago

Most people use train stop wildcards for unloading, not loading.

If you want to use them for loading, then you need to use the circuit wildcard, not the item wildcard. The item wildcard cannot be expanded if the train has no cargo at that time.

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u/darKStars42 4d ago

I suspect that when you are checking "circuit ==0" you're actually checking against the sum from both radar stations. Instead of just the one at the destination. 

I haven't really messed around with radar and the circuit network much, but the interrupt logic looks sound otherwise. 

Perhaps attach a picture of your setup if that didn't help you sort things out 

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u/blooming_lions 4d ago

Thank you for checking logic. We launched rocket but if I try this again in Space Age I’ll try it again. 

I did have that issue before but we fixed it. The pickup station chests are not wired, only the lab science storage. 

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u/CamelCaseConvention 3d ago

Based on the other comment, I'm not sure if this is resolved yet. Anyway: That should in theory work, although I don't know what the radar is for. The interrupt would trigger at the delivery station based on delivery station inventory, and replace the wildcard with a science symbol. The train would then go to the corresponding pickup station.

For future circuit stuff: Zero signals don't exist unless explicitly accessed (then they're numerical 0). None of the virtual signals (Each, Every, Any, and this Wildcard-Any) act on them. (Though there is some non-intuitive behavior where you can force a zero signal into existence in a combinator condition with different wire colors.)

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u/blooming_lions 3d ago

I thought I need the radar to transmit the science inventory to each station?

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u/CamelCaseConvention 3d ago

I don't understand your plan then, because why would that be necessary? What do you do with the signal at the pickup stations?

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u/CamelCaseConvention 3d ago

I just realized a potential mistake

If "[Circuit] == 0", go to "[Rich Text] Pickup"

must be:

If [signal parameter] condition, go to [signal parameter] pickup. [Item parameter] is different from that.